[Bug fortran/30438] Set but never used variable should raise warning

[tkoenig at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30438

--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
The following is still incorrect:

program main
  integer :: i
  real, dimension(100) :: a
  i = 42
  read (*,*) a(i)
end program main

$ gfortran -Wall read.f90 
read.f90:4:6:

    4 |   i = 42
      |      1